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Berakhot 2:4:Workers can recite [Shema] on top of a tree or on top of a wall of stones, which they are not permitted to do for [reciting the Shemoneh Esreh] prayer.

האמנין קורין בראש האילן או בראש הנדבך, מה שאינן רשאין לעשות
כן בתפלה.

Berakhot 2:5: A groom is exempt from reciting Shema on the first night, until Saturday night if he has not done the deed. A story about Rabban Gamliel who recited [Shema] on the first night that he got married. His students said to him: Didn’t you teach us, our teacher, that a groom is exempt from reciting Shema on the first night? He said to them: I will not listen to you, to remove the kingdom of heaven from me for even one hour.